Although it’s been five months since Microsoft first announced Windows Phone 7.8, this version of the OS didn’t officially reach any handset until now. But that might happen soon.

According to Tech Crunch, a Microsoft spokesperson declared: “We have made no further announcement on this but hope to share more details in the near future.” However, WMPowerUser has it that Microsoft may launch WP 7.8 this Wednesday, on November 28.

When it finally arrives, Windows Phone 7.8 will be made available to older WP 7 devices (although it seems that not all will get the update), as a consolation for them not being able to run the new Windows Phone 8. The update should bring a new Boot screen, new Start screen, resizable Live Tiles, and other enhancements.

Meanwhile, a Chinese website has posted a video showing off the Nokia Lumia 510 running Windows Phone 7.8 (see below). Last month, when Nokia announced the 510, it said that the handset would be updated from WP 7.5 to 7.8 some day. And it looks like that day isn’t far away now.

The Lumia 510 is Nokia’s cheapest Windows Phone handset to date, costing around $199 (unlocked), and featuring a 4 inch WVGA display, 800 MHz single-core processor, 512MB of RAM, and 4GB of internal memory. The device seems to be available only in Southeast Asia for now.